Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 437 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
3. 3.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points straight up (c) points right (d) points left
5. 5.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
9. 9.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
10. 10.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
16. 16.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points up and right (c) points left (d) points right
24. 24.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points up and left
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and right (c) points straight up (d) points up and left
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 30° to 0°. How many degrees does it turn?

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